A monitor tilting structure of a car audio/video system is provided. The structure includes: a system housing having a car audio/video driving circuit built in; a guide rail provided at an inner side surface of the system housing; a first guide rod provided at one lower side of the system housing; a second guide rod hinged at its lower end with the first guide rod; and a monitor main body having a pin moving on the guide rail, and having a hinge shaft provided at its rear surface, the hinge shaft being connected with an upper end of the second guide rod.